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Let's go back a few years

Anybody remember the Zone Perfect Control Center of 1994? Attached is a picture of the circuit board. What do the relays that are circle control? I haven't had my system on for awhile and the led above the far left is lit, indicating an energized relay. What is it telling me? Any help greatly appreciated.

Thank you billva, but I don't think that is it. the heartbeat led is flashing green 1 per second. I know the 3, 4, and 5 led are for the zones and led 6 is for the fan. 1 and 2 led I do not know what they indicate. the four leds in the upper middle of the diagram are for the diagnostics, the 6 leds above the relay indicate the relay is energized.